Heat-insulated paper bag and method of making the same



J. N. DESTE ET AL.

Filed Aug. 27, 1951 lNV ENTORS Y or salt have to be disposed of.

Patented F eb. 28, 1933 UNITED STATES JOHN N. DESTE,' 0F MILO, MAINE,

SETTS, ASSIGNORS TO JIFFY PAD & 'EXCELSIOR, INC OF A CORPORATION OFDELAWARE PATENT OFFICE BOSTON, MASSACHUSETTS,

Application filed August 27, 1931.

This invention relates to a new and improved means for protecting andmaintaining in desired condition perishable food stuffs or the like, andhas particularly to do with a novel heat-insulated flexibleflat-bottomed paper bag stuffs, hot or cold, ing the same.

The invention finds its chief use in connection with the sale andpreservation of ice cream and other frozen products, providing aconvenient and inexpensive means for maintaining frozen products inproper condition during transportation and until used, after which itcan be thrown away. For this purpose the bag may be used with or withoutdry ice (solid carbon dioxide) according to the length of time it isdesired to keep the interior of the bag at a relatively low temperature..It has been found in practice that the bag is a particularly effectivemeans for maintaining food stuffs at desired temperature.

The invention possesses many advantages over present methods of icecream distribution in that no return calls are required to collect theusual can and bucket, and no ice The ice cream quickly dispensed and andthe method of makcan be easily and stowed in the bag as required, Thereis a considerable saving in material, space, time and trouble inhandling and packing, as compared with iced containers or the rigid andrelatively large box-like containers in which dry ice has sometimes beenemployed as a refrigerant. Moreover, all these advantages are secured ata relatively low cost, for the herein described heat-insulating bag canbe cheaply and quickly made from various low.- grade materials such asjute waste, cotton waste, or waste paper, for example, newspapers, itbeing well known that such matenumber of air cells rials provide aninfinite eflective insulating and thereby form a very material.

In the drawing, which shows the preferred form of bag and method ofmaking the same;

Fig. 1 is a perspective view of a pad from which the bag may be made andis cut and for holding and transportingfood Serial N 0. 559,658,.

brpiken away-toillustrate the interior of the P 5 Figs. 2 and 3illustrate the formation of the bag with the bottom in the process ofbeing folded and with the adhesive strip of Fig. 2 ready to be appliedto the side and bottom of the bag.

Fig. 4 is a perspective view showing the bag completed and with theadhesive strip of Fig. 2 applied to the same; and

Fig. 5 is a perspective view showing the loaded bag with the top foldedand adhesivcly secured so as to form a package of box-like form withflat top and bottom.

Referring to the drawing, in which like numerals represent like parts,the bag or bat or filler of any suitable flexible, fibrousheat-insulating material such as jute Waste, cotton waste or wastepaper, but preferably consists of particles of partially disintegratedpaper and completely disintegrated paper as described and claimed in theapplication of August Gerard and Maurice Weisman, Ser. N 0. 276,303,filed May 9, 1928. This material has, in practice, been found toticularly efficient heat-insulating medium and the pad or cushion of theapplication of August and George A. Gerard. Ser. N 0. 332,888, filedJan. 16, 1929, a suitable-means for forming the herein described bag orpackage, though it will be evident that it may be formed in other ways.

Referring to Figs. 2 and 3, there is illustrated the preferred method ofmanufacture of the bag or package in which the flexible pad 2 is folded,say about a form of desired size temporarily placed therein so that thepackagemay be made to closely fit the sides and bottom of the form. Theform is, of course, selected with a view to the size and form of theproduct to be confined in the package, for example, a wrapped brick ofice cream, so as to form a bag that will closely fit the flat surfacesof the brick and minimize air space between said surfaces and theenclosing walls of the package. In practice it is found convenient tofirst wrap the pad about the form so that the pad becomes in eifect arectangular tube with the edges 8 of the pad overlapping as shown inFig. 3, and then form, fold in, and overlap tabs 10 to rovide the flatrectangular bottom of the ag, following which the adhesive tape 12 ofFig. 2 is applied to the bag to seal the overlapped edges 8 and the tabs10 as clearly shown in' Fig. 4. It will be noted that the adhesive tape12 of Fig. 4: has an extended portion 12a which may be used to sealtogether the top edges 14: if it is desired to use the device inordinary bag form, or, the top edges 14 may be folded over (a confinedbrick of ice cream, for example) as tab 16 so as to form a flat toppedpackage with theextended portion of the adhesive tape carried over andfastened thereon to seal the tabs to complete the flat sided form of arectangular package.

The hereindescribed flat-bottomed bag, by reason of its flexibility, maybe readily folded in the same general manner as an uninsulated paperbag. Thus the bags may be readily packed and stowed until ready for use.

What we claim is 1. A heat-insulated bag for perishable food stuffs,comprising layers of paper formed and united to provide a flexibleflatbottomed bag with an outer wall of paper and an inner wall of paper,said outer and inner walls containing and enclosing therebetween a layerof flexible fibrous heat-insulating material. substantially surroundingsaid inner wall and flat bottom of said bag, and providing air cellsbetween the walls.

2. A heat-insulated bag for perishable food stufls comprising pieces ofpaper folded and attached together at their overlapping edges to form afiat-bottomed bag with an outer wall of paper and an inner wall ofpaper,.said outer and inner walls containing and enclosing therebetweena layer of flexible fibrous heat insulating material substantiallysurrounding said inner wall and flat bottom of said bag, and providingair cells between the walls.

3. A heat-insulated bag for perishable food stuffs comprisingsubstantially rectangular pieces of paper in juxtaposition, the piecesof paper being folded so that one of said pieces forms an outer wall andanother of said pieces forms an inner wall of the paper bag and togetherprovide a double-walled flat bottom therefor, said outer and inner wallsand bottom confining a layer of flexible fibrous heat-insulatingmaterial substantially surrounding said inner wall, and providing aircellsbetween the walls and an adhesive strip aflixed near the mouth ofthe bag.

4. The method of making a heat-insulated bag for perishable food stuffswhich consists in first forming a flexible double walled heat insulatingpad comprising layers of paper confining flexible fibrousheat-insulating material therebetween, then folding said pad to form afiat-bottomed bag, and affixing together the flat bottom and the twooverlapping edges of said pad to maintain the pad in bag form.

5. The method of making a heat-insulated bag for perishable food stuflswhich consists in first forming a flexible double walled heatinsulatingpad comprising adhesively attached layers of paper having flexiblefibrous heat-insulating material therebetween, then folding said pad toform a flat-bottomed bag and affixing together the flat bottom and twooverlapping edges of said pad to maintain the pad in bag form.

6. A heat-insulating bag for perishable food stufls comprising layers ofsheet material formed and united to provide a flexible flat-bottomed baghaving inner and outer walls and a layer of flexible fibrousheatinsulating material between said inner and outer walls andsubstantially surrounding said inner wall and fiat bottom of said bag,and means attaching said layers of material to each other solely aboutthe periphery thereof, thereby to confine the insulating materialbetween the layers of sheet material.

7. A heat-insulated bag for perishable food stuffs comprising layers ofpaper formed and united to provide a flexible flat-bottomed bag with anouter wall of paper and an inner wall of paper, said outer and innerwalls containing and enclosing therebetween a layer of flexible fibrousheat-insulating material substantially surrounding said inner wall andflat bottom of said bag, and means confining said layer of insulatingmaterial within the bag. L

JOHN N. DESTE. WILLIAM R. TOWER.

